Transfer Case Sensors
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Transfer Case Sensors
After my Transfer Case was replaced. The front brakes would grab the front wheels whenever I made a small turn. When I made wide turns it was okay. I disconnected the AWD computer module under the drivers seat and the problem went away. Is this bad for the AWD? Where are the sensors and how do I remove them? Once removed do I have to adjust the computer or the sensors? I have Chilton and Haynes manuals but they don't talk about the sensors.
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Transfer Case Sensors
Hi. I've got two AWD Aerostars... a 91 and a 96.
That's not the brakes you feel grabbing the front wheels; its the transfer case engaging on dry pavement causing the front and rear differentials to "bind" against each other. Yes, its very bad for your AWD drive system.
When you pulled the AWD computer from the harness, you stopped the 12v power to the electric clutch in your transfer case... so, the problem went away.
If you don't have a trouble light on the dash, its probably the front and/or rear differential sensors. The computer simply compares the front and rear ring gear rotational rates.... if they are not close to each other, it engages the AWD. One of the diff sensors is bad; when you make a sharp turn, the front and rear gears rotate at a slightly different rate. With a bad sensor, you're exceeded the limit and the transfer case is engaging.
I'm assuming you have four identical tires on the van... it won't tolerate different tire sizes/brands...
KenP
That's not the brakes you feel grabbing the front wheels; its the transfer case engaging on dry pavement causing the front and rear differentials to "bind" against each other. Yes, its very bad for your AWD drive system.
When you pulled the AWD computer from the harness, you stopped the 12v power to the electric clutch in your transfer case... so, the problem went away.
If you don't have a trouble light on the dash, its probably the front and/or rear differential sensors. The computer simply compares the front and rear ring gear rotational rates.... if they are not close to each other, it engages the AWD. One of the diff sensors is bad; when you make a sharp turn, the front and rear gears rotate at a slightly different rate. With a bad sensor, you're exceeded the limit and the transfer case is engaging.
I'm assuming you have four identical tires on the van... it won't tolerate different tire sizes/brands...
KenP
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Transfer Case Sensors
BattleBotsJudge
Thanks for the information. Yes I have the same tires all around. I am going to get two new sensors. Is there a installation procedure for these sensors? Thanks !!!!!!!!!!!
:-)
Thanks for the information. Yes I have the same tires all around. I am going to get two new sensors. Is there a installation procedure for these sensors? Thanks !!!!!!!!!!!
:-)
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Joined: Jan 2001
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Transfer Case Sensors
I replaced one on mine with the same symptoms as yours. I could only find them at Ford, for about 85.00 each. There are two, both located on the transfer case. It took about ten minutes to pull both out and examine them. One looked worse than the other one so that is the one I replaced. They both are the same. The Ford Service Manual tells you to replace one to see if it solves the problem, and then the other one if it does'nt. This is what it says on the box: (F09Z-7F293-A Sensor ASY 868401) Ford had a hard time finding the right one for me on there computer, and then had to order it, took a couple of days. Mine is a 94, I think they all used the same sensors.
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